Developer response

I'm sorry to hear you were having trouble. This was a Firefox bug that affected all extensions, which has now been fixed. You can find Mozilla's blog entry on the issue here: https://blog.mozilla.org/addons/2019/05/04/update-regarding-add-ons-in-firefox/

Wow, now TinEye's crippled itself by pandering to the datamining whOres at google. NO WAY do I allow google's intrusive cookies on MY PC, TinEye, so you and your lazy monetizing execs can go stuff yourselves.

When it does work, it works really well. I found some scammers will take an image frame from a video in order to fool these sorts of things. They can also flip the image horizontally, and I am not so sure this checks for that. Not a bad app though, certainly easy to use, but most of the time it finds nothing. I think with some work it would be really good.